they come in, read about it and pick up the goodies..

some people are not bothered. as long as they have what they wanted, thats all it matters. don't want to share anything.
isn't that selfish?

this is nothing yet

no. trying to. maybe tomorrow. see how lah

aik. where are they?

and I was referring it to you!
Hey.. pics of your post- 'King donuts' are sopposed to be uploaded

Whoa.. posting pictures also need to be in the mood, eh?
ongbs, your 'mini donuts' same size like mine? How many windings?

I may be picking up the upgrade components from Y.C. today. Will try and post some before and after pix later.. 'If I'm in the mood too!" Hahahaha.. Sorry ongbs, can't help it...

Later guys..

This post has been edited by jazzy939: Sep 6 2008, 06:11 AM

haha that goes for you too!

Saw this TA2020 board with good looking 'donuts'..
Thick gauge copper that one.. must use the same ..




Attached thumbnail(s)

The 'pop' is due to the in-rush current to the caps. In my case, its the input caps..
My "KIC" solution is to temporarily disconnect the speakers and reconnect them moments later. Easy when you use banana plugs!
Thinking about making a relay with a timer to connect/disconnect the speakers momentarily during power off/on. Later..

The 'ideal' inductor would low resistance, there are other factors to be considered.. I am also just started to learn about this
This T-Amp thingy roped me to other aspects of DIY and circuit designs..

Some info I got on AIR CORE INDUCTORS:

What are the advantages of an air core coil?

Its inductance is unaffected by the current it carries. This contrasts with the situation with coils using ferromagnetic cores whose inductance tends to reach a peak at moderate field strengths before dropping towards zero as saturation approaches. Sometimes non-linearity in the magnetization curve can be tolerated; for example in switching converters. In circuits such as audio cross over networks in hi-fi speaker systems you must avoid distortion; then you need an air coil. Most radio transmitters rely on air coils to prevent the production of harmonics.
Air coils are also free of the 'iron losses' which affect ferromagnetic cores. As frequency is increased this advantage becomes progressively more important. You obtain better Q-factor, greater efficiency, greater power handling, and less distortion.
Lastly, air coils can be designed to perform at frequencies as high as 1 Ghz. Most ferromagnetic cores tend to be rather lossy above 100 MHz.

And the 'downside'?

Without a high permeability core you must have more and/or larger turns to achieve a given inductance value. More turns means larger coils, lower self-resonance and higher copper loss. At higher frequencies you generally don't need high inductance, so this is then less of a problem.
Greater stray field radiation and pickup. With the closed magnetic paths used in cored inductors radiation is much less serious. As the diameter increases towards a wavelength (lambda = c / f), loss due to electromagnetic radiation will become significant. Balanis has the gory details. You may be able to reduce this problem by enclosing the coil in a screen, or by mounting it at right angles to other coils it may be coupling with.

This post has been edited by jazzy939: Sep 6 2008, 07:54 AM

Most amps have them. Certain amps use 'anti-thump' circuits. NAD is one that I know.
Both my Technics have them(relays), even my Yamaha pre-amp have relays to connect the output when power has stabilized after switching on. I can always pickup the soft clicking sounds when switching ON and OFF.

Yes and NO. Most speaker protection boards/kits that I came across are for the speaker protection against excessive power, clippings and maybe DC voltage protection. They may employ the 'anti-thumping' circuits.. so depends on the design again.

Aha! Something for your project huh?

Not at all. This is what the forum is for.. I think we have slightly detoured from the thread topic but I guess it's ok!

I think it's still related because we're talking about the pop/thump thingy that T-Amp also demonstrates...

hey morning to you!
hehehe.. can't sleep after my sahur

there's 2 schools here with regards to relays.. 'purist' would go against it I think..
Still I want some protection to protect my investments in that pair of great speakers of mine! It has been discontinued and I don't think I can get anothet pair! The company has also gone 'bungkus'

3 of my commercial amps have relays.. I guess we have to use quality relays like the OMRON for example.. thats what my sifu says...

There is a good readup on Class D Amplifiers: Fundamentals of Operation and Recent Developments
esp. the eliminating of external filtering.. interesting!
Its from MAXIM website. There are even free samples from the website too!

The LINK

This post has been edited by jazzy939: Sep 6 2008, 08:52 AM

Y.C.,
Thanks for the 'quick' review on your setup. You sure can write excellent reviews
How many hours have you clocked since?
I can sufficiently say that anyone who browses this thread will be(sufficiently)poisoned by our reviews

From the pix, I see that you're still on the stock caps.. Maybe you should burn in with the stock components and lets say around 20 hrs. you start the 'little' mods.. Let the stock sound etched in to your mind
Then you listen the improvements in leaps and bounds and all after your intended mods

I was in JP this afternoon, the reason why I can't make the afternoon appointment
Got meself TWO SMPS from the same shop, same price for the 12VDC 4.2A! This one is for mysghooi.
And I bought a smaller 12VDC 1.2A to 'play-play' .
Also got meslef a few 10000uF caps, white LEDs for panel pilot light, spares for my unserviceable bench PSU which I busted recently while testing my buch of LEDs, quick blow fuses for the PSU and some Elna 2.2uF caps!

Some good news.
I managed to make my bench PSU serviceable again! The regulator IC went kaput, drop in a new one and its a okay!

Change my first board input caps to Elnas.. am still burning in.. no quick review yet. First impression: Absolutely worthy replacement of the stock caps The midrange and highs was terribly superb.. the stock caps were a touch 'grainy', now super duper clear, clean and sharp. Complemented by the 'donuts' inductors.. simply super..
Still this one remains; although the bass is there, it is barely felt..

No changes to my second board. I think tomorrow will start to bi-amp the amplifier..

No 'star grounding' reqd. for the T-Amp unlike GainClone. Still it can be done by employing a 'floating' ground Sorry, my terminology hehe.. or make a 'ground bus' (borrowing an aviation term)

Still, if you want to use the wooden box.. shielding can still be done With a little ingenuity, problem solved
This one you gotta ask to get it.

Y.C.,
I can't decide if this is an insult or compliment to the digital medium! hahaha

Y.C.,
You're most welcome
True to the words, we're doing this, ie sharing and learning at the same time because of our passion. Yes.. time for me tocontribute after all this while just reading and learning all those great stuffs from the forums all over

Local mag? Engaging us? Would you accept the offer? I would! I got to play with the TOYS!

Nah NOT the Cerafine, just a 'normal' one.. Will put up some pictures later.. I am 'not at home' this moment..

Can't wait to get my other stuffs for the 'upgrade'.. looks like more reviews coming up...